public String tifTransfertoJpg(String filePath,String fileName) throws IOException{

/* tif转换到jpg格式 */

String input = filePath+fileName;

String output = filePath+fileName.substring(0, StringUtils.lastIndexOf(fileName, "."))+".jpg";

RenderedOp src = JAI.create("fileload", input);

OutputStream os = null;

os = new FileOutputStream(output);

JPEGEncodeParam param = new JPEGEncodeParam();

// 指定格式类型，jpg 属于 JPEG 类型

ImageEncoder enc = ImageCodec.createImageEncoder("JPEG", os, param);

enc.encode(src);

os.close();

return "ftp/"+fileName.substring(0, StringUtils.indexOf(fileName, "."))+".jpg";

}